p9_1.cpp

相当丰富的C++源码

/*******************************************
 *  p9_1.cpp                               *
 * 重载+、-、++为类的友元函数，进行复数运算*
 *******************************************/
#include<iostream>
// using namespace std;
using std::cout;
using std::endl;
class Complex	                                  //复数类定义
{
private:	
    double real;    	//复数实部
    double image;	    //复数虚部
public:	
	Complex(double real=0.0,double image=0.0) //构造函数
	{
		this->real=real,this->image=image;
	}
    void display()
	{
	    cout<<"("<<real<<","<<image<<")"<<endl;
	}
	friend Complex operator + (Complex A, Complex B)  //重载+为友元函数         
	{                                          //重载运算符+的函数实现
	   return Complex(A.real+B.real, A.image+B.image);  
	}
	friend Complex operator - (Complex A, Complex B);  //重载-为友元函数
    friend Complex operator - (Complex A);	        //重载-(取负)为友元函数
    friend Complex operator ++ (Complex& A);        //重载前置++为友元函数
	friend Complex operator ++ (Complex& A,int);     //重载后置++为友元函数
};	                                     
Complex operator -(Complex A,Complex B)	    //重载运算符-的函数实现
{
	return Complex(A.real-B.real, B.image-B.image);     
}
Complex operator -(Complex A)	              //重载运算符-(取负)的函数实现
{
	return Complex(-A.real,-A.image); 
}
Complex operator ++(Complex& A)	      //重载运算符前置++的函数实现
{
	return Complex(++A.real,A.image); 
}
Complex operator ++(Complex& A,int)	   //重载运算符后置++的函数实现
{
	return Complex(A.real++,A.image); 
}
void main()	
{
	Complex A(100.0,200.0),B(-10.0,20.0),C;	
	cout<<"A=",        A.display(); 
	cout<<"B=",        B.display();
   	C=A+B;                              //使用重载运算符完成复数加法
	cout<<"C=A+B=",    C.display();
    C=A-B;	                             //使用重载运算符完成复数减法
	cout<<"C=A-B=",    C.display();
    C=-A+B;
    cout<<"C=-A+B=",   C.display();
	C=A++;
	cout<<"C=A++, C=", C.display();
    C=++A;
    cout<<"C=++A, C=", C.display();
	C=A+5;	           
	C.display();
}